Well-drilling tool



Dec. 23, 1930. c. a. KENNEDYE 1,786,415

WELL DRILLING TOOL Original Filed May 18, 1925 2 Sheets-Sheet 2 I N ws/v 7'02 Char/e5 .5. Mann e a y TTOEME Y Patented Dec. 23, 1930 UNITED sures OEABLEQ n. xnmmnrn, or cum-nan? our, mssoonr, asszenon To run mmnnnrn coarona'rron, or wrmuno'ron, nmwaan, A conrom'rron or DELA- WARE Continuation of application Serial No. 81,058, filed Kay 18, 1925. This application fled November 9, 1980. Serial No. 08,178.

This application is a continuation of my co-pending application, Serial No. 31,058, filed May 18, 1925.

Many difficulties have been experienced in drilling wells of relatively great depth. For instance, in drillin through formations ot varying degrees of ardness, the bits become dull and do not drill a hole of uniform diameter. Or, a hard spot in the formation may force the drill out of vertical line, roducing a kink in the side walls of the be e. 7 Or, a projectin stone loosened b" the drill may protrude inwardly beyond t e riphery of the hole, causin the casing, w on lowered into place, to stic and bind. Very frequent- 1y, proper placement of the casin is prevented because the walls of the dril ed hole are f neither smooth nor exactly vertical. These difiiculties and conditions require that the casin be raised and withdrawn to emit reaming of the hole to proper size to al ow the casing to be lowered into place. Also, the bits must be withdrawn to permit resharpening.

To obviate these time-consuming and expensive steps, I have devised, and my invention has for a primary object, the provision of a well-drilling tool comprising drilling and reaming bits of novel construction for the economical and efiicient accomplishment of the dual operations of drilling and reaming at the same time.

My invention has for another object the provision of a tool of the type stated com rising a body or stock'and a plurality 0 detachable bits that may be readily and conveniently removed and replaced. The stock and bits are so constructed that the bits, when in operative position, are firmly and securely held against accidental displacement.

My invention has for a still further object the provision of av tool of such construction that water under pressure is discharged directly upon the cutting edges of the bits and own the bottom of the hole bein drilled, with the result that the drilling of t e well is greatly facilitated.

My invention has for a still further object the improvement of rotary well drilling tools.

In the accompanying drawings, Fig. 1 is a view, partly in elevation and artl in lon 'tudina'l section, of a rotary we -dri ling too embodying my invention.

Fig. 2 is an elevational view of the tool taken at right anglesto the view illustrated in Fig. 1.

Fig. 3 is an inverted plan or bottom view of the tool.

Fig. 4 is a detail sectional view of the tool taken on the line 4-4 of Fig. 3.

Fig. 5 is an elevational view of the tool of my invention equip d with drilling-bits of the reversible ty e s own in Fig. 6.

Fig. 6 is an e evational view of a modified type of detachable drilling-bit forming part of the tool.

Referring more in detail to the drawings, A designates the body of the tool, which is constructed of suitable metal and is of suitable weight and dimensions. Body A. has

referabl its-greatest diameter at a int 1 mtermedlate its ends. To facilitate illing operations, thelower end isjcut-away upon opposite sides and provided with opposed faces 2, sinuous in surface contour transversely of'the stock in simulation of the tail of a sh, as best seen in Figs. 1 and 2.

From intermediate point 1 the bit-body A is diametrically reduced to provide an annular shoulder 4, and a threaded extension 5 for convenient engagement with the drill-tubing (not shown). 7

Formed in and optfning to the base and to opposite sides of the od A is a pairof oppositely disposed slots 6, w ich ma be dis osed obliquely to the longitudinal axis of be y A.

Also formed in and opening to the base and to opposite sides of the body A is a pair of longitudinal slots 7, which may be radially offset relative to the longitudinal axis of bod A. The slots 6 and 7 on each side of bod may be disposed in pairs. At its base stoc A is so cut away that the slots 6 and 7 of a pair are in 0 en communication, the upper wall 8 of eac slot 7 being dis osed in body A. at a suitable distance from t e upper wall 9 of its companion slot 6.

The stock A is preferabl equipped with two sets of slots 6 and 7, an their accommodated bits, although it is to be understood stock A may be formed to include a greater or lesser number of sets of slots and bits. Inasmuch, however, as the slots and bits are of similar construction, but one pair will be here specifically described.

Formed in one wall of each slot 6 and extending transversely of body A is a recess 10 opening at its outer end to the surface of body A and at its inner end being in semi-cooperative alignment with a threaded screw-seat 11 formed in the end wall of the slot, as best seen in Fig. 1. Also formed in a wall of slot 7 and extendin longitudinally of body A from its lower en to beyond the plane of the wall 8 of companion slot 6 is a recess 12. Also formed in the opposite wall of slot 7 and extending in parallelism with recess 12 longitudinally and upwardly of stock A for a suitable distance from wall 8 of companion slot 6, is a recess 13 closed at its upper. end and opening at its lower end to wal 8 Ada ted to removahlliy fit inthe cross-slots 6, are rilling-bits B. ach drilling bit B includes a body 14 approximately rectangular in configuration and of dimensions to fit within slot 6, and an angularly projecting lower cutting end 15 whose cutting edge is graduall arcuated at the lower, inner corner, as s own at 16. Formed in one of the outer surfaces of bit-body 14, is a transverse recess 17 for bit-retaining cooperation with the recess 10 of stock A and formed in the inner surface of bit-body 14 is a longitudinal recess 18 with which, when hit B is in working position in stock A, the stock-recess 13 forms an aligning continuation.

Similarly adapted to slidably fit in the longitudinal slots 7 are individual reamingbits 0, each comprising a substantially o long-rectangular body 19 which may have its greatest thickness at up oximately its longitudinal center and wh1c may then oppositely taper in thickness towards its ends, as best seen in Figs. 2, 4 and 6. At its opposite ends the bit C is referabl bifurcated and provided with dri 'ng teet 20. The bit C and its accommodating slot 7 are of such relative dimensions that, when in working position in stock A, bit C fits endwise in the slot and projects outwardly beyond the plane of the adacent face of stock A. I may here state that the bits B and C and their accommodating slots 6 and 7 are of such relative dimensions that normally the teeth 20 are disposed in sub stantially the same cutting plane as the cutting edge of the drill-bit Formed longitudinally in the opposite side faces of the bit C are parallel recesses'21, one of which is adapted for bit-locking co-operation with the drillbit recess 18 and its stock-recess continuation 13 and the other of which is ada ted for cooperation for a like purpose wit the stockrecess 12.

In use and operation, a rib or ribs 23 may be placed in the recesses 21 of reaming bit C and said bit then forced upwardly into the stock to fit in the head in a slot 7, the rib or ribs registering with the recesses 12 and 13 in the wall of the slot 7 The drillin bit B is then inserted upwardly to fit in the cad in a slot 6, and a pin 22 fitted end-wise in the transverse recesses 10 and 17, the pin 22 being threaded at its end into the socket 11, as best seen in Fig. 1. It will be understood that the rib 23 re isters with the recess 18 in the drillin bit 15. a

he rib or ribs 23 thus form rojectives in the nature of locking-ribs on the reamer C, and thus effectively positively retain both the drill-bit B and the reamer-bit C from sidewise displacement.

It will be obvious, therefore, that upon removal of pin 22, the bit B may be removed, and on the application of proper force on the upper end of reamer C, the latter may be driven downwardly, and either or both bits repaired or replaced. It will be evident that, while I here show the ribs 23 as separate or loose from the bit C, such ribs ma if desired, be integral with the reamer When so locked in the body A, the angular cutting ends 15 of bits B are rojected in the direction of rotation of the Body with their rounded lower corners 16 inwardly resented relative to the stock, their longitudinal axis being parallel, corresponding to the obliquely disposed arrangement of their accommodating slots 6 and their cutting ends 15, comletin the resemblance of body A and its bits to t e tail of a fish. Normally the drilling plrongs 20 of reamersC are substantially on t e same horizontal cutting lane as the cutting edges of the drilling bits being disposed in the rear of the cutting edges of drilling bits B, functioning to materially assist the bits B in effective drilling operations. I}! practice, the bits B at their outer sides extend slightly beyond the arcuated sidefaces of the reaming-bits O and form straight lines parallel with the longitudinal axis of the stock A. By this construction, the diameter of the hole being drilled is uniformly maintained. The reamers C efliciently function in the rotary actuations of stock A in smoothing and straightening the walls of the hole being drilled.

Thus, b means of my new tool, both reaming and rilling operations may be accomplished at the same time. Both reaming and drilling bits may be inexpensively repaired or replaced, and I may add that my new tool has been found exceedingly eflicient in use and operation, is relatively inexpensive in maintenance, facilitates and largely reduces the cost of well drilling, and accomplishes full the objects and purposes hereinbefore state It will be evident further that, when the prongs 20 at one end of a reamer 0 become worn. the reamer may be reversed to present its other end-prongs for drilling operations Hill means i or itsother side facefor reamin operations. And for a like urpose I may se actively employ drillin bits or the type B shown specifically in igs. 5 and 6, which in configuration are substantiallyesimiiar to bit .B, except that its so-called body-portion 14' and its cutting-end portion 15' are duplicates, the body 14 having a like cutting edge arcuated at one corner, as at 16-, and the cutting-end portion 15' having both a pin-accommodating transverse recess 17' and a rib accommodating longitudinal recess 18', whereby when that portion of the rib presented for drilling operations becomes worn, the bit may be reversed to present its other portion for drilling operations. 7 Y

Formed in approximately the longitudinal center of the body A is a water duct 24, P

which extends from the upper end of stock A, where it is adapted for open communication with the inlet channel of the drill-tubing (not shown), to a point, as at 25, adjacent the slots 6, where channel 24 divides into branchducts. 26, o ening u on the outer surface of stock A to orm sur ace grooves for conducting thedischar 'ng water more orless direct- 1y upon, and t ereby'" flushing and keeping clean, the drilling bitsB. It will be understood thatwater, under considerable head is forced along the cuttin surfaces of the drilling bits B and upon the bottom ofthe hole being drilled in such a manner-{as not only to remove loose matter from the articular well, but also to keep the bits B su tantiall entirely free from accumulated dirt, stoneust andthe like.

I claim as my invention:

1. A' rotary well drilling, tool including in combination, a head having en slots, primary drilling bits removably carried in said end slots and extending outwardly be end the side of the head to cut a hole of pre etermined size, longitudinal slots in the sides of the head communicating with the end slots, elongated reaming bits each having an elongated reaming side projecting beyond the side of the head and lying ina plane parallel to the lane of the head removabl mounted in the ongitudinal slots, said reaming bits being disposed immediately adjacent the rimary drilling bits, and having cutting e ges on-their lowerends acting as secondary drilling bits.

2. A rotary 'well drilling tool, including in combination, a head havin end slots, of primary drilling bits remove ly carried insaid end slots and extending outwardly beyond the side ofthe head to cut a hole of predetermined size, longitudinal slots in the sides of the head communicating with the end slots, elongated reaming bits each having an elongated reaming side projecting beyond the side of the head and lying in a plane parallel t0 the plane ofthehead removably mounted in the longitudinal slots, said reaming bits being dis osed immediately adjacent the rima dri ling bits,and having cutting gas on their lower ends acting as secondary drilling bits, and means cooperating between the reaming bits and head for preventing accidental side-wise dis lacement.

3. A rotary well rilling tool, including in combination, a head havm end slots and extend ng outwardly beyon the side of the head to cut a hole of predetermined size, of primary drilling bits removably carried in said end slots, longitudinal slots in the sides of the head communicating with the end slots, elongated reaming bits having an elongated reamingi'side pro ecting beyond the side of the has and lyin in a plane parallel to the lane of the bee and removably mounted in the longitudinal slots, said reaming bits being disposed immediately in the rear of the primary drilling bits, and having) cuttin ends acting as secondary drilling its, an means cooperating between the drilli bits and the head for preventing accidental ongitudinal displacement of the former.

4. A- rotary well drilling tool comprising in combination, a supportin head provide with a longitudinal slot an a separate but communicating transverse slot openin respectively to a side and to the base 0 the head, a reamer having a body portion and a reaming edge adapted to have removable coo erative engagement with said head in said [on 'tudinal slot in such manner as to cause on y a relative] small portion of said reamer, including sai reamin edge, to project beyond the side wall of sai head, a drillmg bit also adapted to have removable c ooperative engagement with said head in said transverse slot, the main surface of the drilling bit being disposed in contact with the main surface of said reamer, said drilling bit having acuttin ed projecting from the base of said heag, an means associated with the reamer adapted for engagement with boththe stock and the drilling bit for detachably securing said reamer and drilling bit from unintentional sidewise displacement.

5. A rotary well drilling tool comprising in combination, a supporting head having a longitudinal slot opening to a side thereof and a longitudinal recess in a wall defining said slot, a reamer disposed for removal in said slot, said reamer having means associated therewith for engaging the head at said recess for detachably securing said reamer against sidewise displacement, a transverse slot communicating with saidlongitudinal slot, a drilling bit removably carried in the transverse slot having a bottom cutting edge, and extending outwardly beyond the side of the head to cut a hole of predetermined size, said reamer having a cutting edge disposed at the bottom portion thereof, and adapted to cut in the same circular cuttin plane as the bottom cuttin edge of the dril ing bit.

6. A rotary wel drilling tool comprising in combination, a supporting head having a longitudinal slot and a longitudinal recess disposed in a wall of said slot, a reamer disposed for removal in said slot, and a locking rib cooperatively associated with said reamer for engagement with said head at said recess for detachably securing the reamer against sidewise displacement, a transverse slot communicating with said lon 'tudinal slot, a drilling bit removably carried in the transverse slot having a bottom cutting edge, and extending outwardl beyond the side of the head to cut a hole 0 predetermined size, said reamer having a cuttm edge disposed at the bottom portion thereo and adapted to cut in the same circular cutting lane as the bottom cutting edge of the dri ing bit.

7. A rotary well drilling tool comprising in combination, a supporting head having a longitudinal slot opening to the side thereof and a longitudinal recess disposed in a wall of said slot, a reamer comprising a. body portion and an elongated reaming surface adapted to have remo able cooperative engagement with said head in said longitudinal slot in such manner as to cause only a relatively small portion of said reamer, including said reamin surface, to project beyond the side wall 0 said head, and a rib projection as sociated with said reamer adapted to have cooperative locking en agement with the head in said recess for etachably securing the reamer against unintentiona sidewise displacement, a transverse slot communicating with said longitudinal slot, a drilling bit removably carried in the transverse slot having a bottom cutting edge, and extending outwardly beyond the side of the head to cut a hole of predetermined size, said reamer having a cutting edge disposed at the bottom portion thereof, and adapted to cut in the same circular cutting plane as the bottom cutting edge of the drilling bit.

8. A rotary well drilling tool comprising incombination, a supporting head having communicating transverse and longitudinal slots and a recess in a wall of the longitudinal slot, a drilling bit disposed for removal in said transverse slot, a reamer having a body portion and an elongated reaming surface adapted to have removable cooperative engagement with said head in said longitudinal slot in such manner as to cause a relatively small portion of said reamer, including said reaming surface to project beyond the side wall of said head, a main surface of the drilling bit being disposed in contact with a main surface of the reaming bit, and means comprising a locking rib cooperatively associated with a surface of said reamer adapted for engagement with said recess for securing said reamer placement.

9. A rotary well drilling tool comprising in combination, a supporting head, a primary cutting blade mounted in said head and projecting therebelow adapted to cut a hole of predetermined'size, and a secondary blade mounted in said head and projecting therebelow adapted to cut on the bottom of the hole in the same circular cutting plane as the primary blade and simultaneously ream the side of the hole to auge, a main surface of the primary cutting b ade being disposed in contact with a main surface of the secondary blade.

10. A rotary well drilling tool comprising in combination, a supporting head, a primary cutting blade detachably mounted in said head and projecting therebelow adapted to cut a hole of predetermined size, and a secondary blade detachably mounted in said head and projecting therebelow, adapted to cut on the bottom of the hole in the same circular cutting plane as the rimary blade and simultaneously ream the ole to gauge, a main surface of the primary cutting blade being disposed in contact with a main surface of the secondary blade.

11. A rotary well drilling tool comprising in combination, a supporting head having a longitudinal slot opening to a side thereof and a communicating transverse slot opening to the base thereof, a primary cutting blade against accidental sidewise dis- -detachably mounted in said transverse slot and projecting below said head adapted to cut a be e of predetermined size, and a separate blade detachably mounted in said longitudinal slot and rojecting beyond the side wall and also be ow the base of said head adapted to cut on the bottom of the hole in the same circular cutting plane as the primary blade and simultaneously ream the hole to gauge a main surface of the primary cutting blade being disposed in contact with a main surface of the said separate blade.

12. A rotary well drilling tool comprising in combination, a supporting head, a primary cutting blade detachably mounted in said head and projecting therebelow ada ted to cut a hole of predetermined size, an a secondary blade detachably mounted in said head and projecting therebelow, adapted to cut on the bottom of the hole in the same circular cutting plane as the rimary blade and simultaneously ream the ole to gauge, said primary cutting blade having coopera tive engagement with said secondary blade to lock said secondary blade in said head, whereby said primary blade must be removed from said head before said secondary blade can be removed from saidjhead.

13. A rotary well drilling tool comprising in combination, a head, a primary drilling blade removably mounted in said head, a second blade having an elongated reaming side 1,7se,41a

and a cutting edge, said second blade rojecting beyond the side of said head an lyin in a plane parallel to the axis of the head, said second blade being dis (1 immediately adjacent the rimary b ade whereby the lower cutting e e acts as aseconda cuttin la e, a main face of the prima drifim' g blade being disposed in contact wit the main face of t e second blade.

- 14. A rotary well drilling tool comprisin in combination a sup rti head provid with a longitudinal at an a se arate but communicating slot be opening respectively to a side and'to the base of the head, said longitudinal slot being closed at its upper end, a reamer having a body ]portion and a reaming sdrface adapted to ave removable coo ative engagement with said head and said ongitudinal slot in such manner as to permit only a relatively small portion of said reamer, including the surface thereof to pro'ect'beyond the si e wall of said head 1: dr' 'ng bit also adapted to have removable cooperative engagement with! said head in said transverse slot,-said drillin bit having a cutting ed projecting from t e base of said head, an means associated with the reamer adagted forenga ement with both the head an the drilling it for detachably securin said reamer from unintentional sidewise (11S lacement.

15. A rotary well dri 'ng tool comprising in combination a sup ortin head provide with a longitudinal ot an a se arate but communicatingtransverse slot bot openi respectivel to a side and to the base of the head, said ongitudinal slot bein closed at its up r end, a reamer having a y portion and a reaming surface adapted to have removable coo rative engagement with said head and sai longitudinal slot in such mannor as to permit only a relatively small portion of said "reamer, including the reaming surface thereof to projfict beyond the side wall of said head, a dri 'ng bit also adapted to have removable cooperative engagement with said head in said transverse slot, said drillin bithavin a cuttin edge projecting from t e base 0 said has and means associated with the reamer ada ted for en ment with both the head an the drilling it for detachabl securingfsaidreamer from unintentional si ewise displaoement, said reamer being insertable in said head only b longitudinally sliding said ream'er upwar y in said head, said reamer being cut awa to contact and be supfiprte'd by the dr' 'ng bit whereb the dr: 'ng bit must be removed from t e head before the reamercan be removed.

16. A rotary well drilling tool comprisin in combination a sup ortin head provide with a longitudinal 0t an a se arate but communicatingtransverse slot opening respectively to a side and to the base of the head, said longitudinal slot beingocliosed at its upper end, a reamer having a y portion an a reaming surface adapted to have removable coogerative engagement with said head and sai longitudinal slot in such manneras to permit only a relatively small portion of said reamer, including the surface thereof to p 'ect beyond the sills wall of said head a g bit also adapted tohave removable cooperative en t glith saig had in said transverse slot, said ilhng' it vingacuttin edge projectmg' from e base of said head, and means associated with the reamer adapted for ment with both the head an the drilling it for detachably securing said reamer from unintentional sidewise displacement, said reamer being ineertable upwardlg in saidhead until thteh upptg l ofhsai reamar inst e w c osm t e u on o sai it: 'u dinal nos 8 f: 01

'.rotaryw inu'in combination, a head having radial base ots and loggitudinal side slots communicatin therewi drilling bits 'removably mounted in said radial slots, reamin bits removably mounted'in said longitudin slots,-the outer edges of said reaminglbits extending beyond the adjacent face of e head and presenting elon ated ream" surfaces lying in a plane para el to the axis of the head, said drilling its and reaming bimrojectin from the base of the head, and having ttom cutting edges rotating in the same circular cutting plane. a

18. A rotary well drilling tool includin in combination a head having radial base slots and longitudinal side slots, drilling bits a'dalpted to. be removably mounted in said radia slots, reaming bits adapted to be removably mounted in said longitudinal slots, the outer edges of said reaming .bits extending beyond the adjacent face of the head and presenting elongated longitudinal reaming sides liin in a plane parallel to the axis of the ca said drilling bits and reaming bits rojecting from the base of the head, and bot having drilling edges rotating in the same orbit, said reaming bits being mounted immediately ad acent and in contact with the drilling bite, the drilling edges of the reamers operating as secondary cutters.

19. A rotary well drilling tool inclu in combination a head having radial base ots and longitudinal side slots, drilling bits adapted to be removably mounted in said radial slots, reaming bits adapted to be removably mounted in saidlongitudinal slots, the outer edges of said reamin bits extending beyond the adjacent face 0 the head and presenting elongated longitudinal reaming sldes lyin in a lane parallel to the axis of the bee said illingbits and reaming bits rojectingfromthe ase'oftheheaihandaith having drilling edges rotating in the same circular cutting plane, said reaming bits being mounted immediately adjacent and in contact with the drilling bits, the drilling of the reamers operating as secondary cutters said drilling bits being bent intermediate their length to provide drilling edges projecting forwardly into the path of rotation while the drilling edges of the reaming bits lie in a lane substantially parallel to the longitu axisof the head.

20. A rotary well drilling tool comprising in combination a supporting head provided with longitudinal slots communicating with ofiset transverse slots 0 enin 7 respectively to the sides and base 0 the ead, reamers adapted to have removable cooperative engagement with said head in said longitudinal slots, each reamer comprising a body portion having an elongated relatively thin surface projecting beyond a side wall 0 the supporting head, a substantial portion of each reamer being supported in and enclosed by said head, drilling bits also adapted to have removable cooperative enent with said head in said transverse slots and dis osed in contact with said reamers, said dr 'ng bits projecting from the base of said head and having cutting edges on their lower ends, said reamers also provided with outt' edfi on their lower end to simultaneous d on the bottom of the hole in drille by the drilling bits and so dispose as to rotate in the same circular plane as the drilling bits.

21, A rotary well drilling tool comprising in combination a su porting head provide with a longitudinal ot communicating with an ofiset transverse slot openinglrespectively to a side and to the base of the ead, a reamer having a body portion and an elongated relatively thin reaming surface adapted to have removable coo rative engagement with said head in sai longitudinal slot in such manner as to cause a relatively small portion of said reamer, including said reammg surface, to priciest beyond t e side wall of said head, a d ling bit also adapted to have removable cooperative engagement with said head in said transverse slot, the main surface of which drilling bit is dis posed in contact with a main surface of said r'eamer', said drillm bit projecting from the base of said bee and having a cutting edg on its lower end, said reamer being provided with a cuttin edge on its lower end to simultaneousl rill on the bottom of the hole being dri ed by the drilling bit and so disposed as to rotate in the same circular plane as the drilling bits.

22. A rotary well drilhng tool comprising in combination a supporting head provide with longitudinal slots communicating with oflset transverse slots opening respectively to the sides and base 0 the sad, reamers -ofiset transverse slots openin adapted to have removable cooperative engagement with said head in said longitudinal slots, each reamer comprising a body portion having an elongated relatively thin reaming surface projecting beyond a side wall of the supporting head, a substantial portion of each reamer being supported in and enclosed by said head, drilling bits also adapted to have removable cooperative engagement with said head in said transverse slots and dis used in contact with said reamers, said dr' ing bits having cutting edges projectin from the base of said head, each drilling it comprising a supporting body portion adapted to be sup orted in and enclosed by said head and a rilling blade provided on. its extreme lower edge with a substantially horizontal cutting surface of considerable area, said reamers being provided with cuttin edges on their lower end to simultaneou g drill on the bottom of the hole bein drille by the reaming bits and so dispose as to rotate in the same circular plane as the drilling bits.

23. A rotary well drilling tool comprisin in combination a su porting head provi ed with longitudinal s ots communicating with ofiset transverse slots opening respectively to the sides and base of said head, reamers adapted to have removable coo erative engagement withsaid head in sai longitudinal slots, each reamer having a relatively small portion projecting beyond the side wall of said head, terminating in an elon ted edge adapted to be resented to the ormation being drilled, dri ing bits also adapted to have removable cooperative engagement with said head in said transverse slots, said drilling bits having cutting edges projectin from the base of said head, said reamers ing provided with cuttin edges on their lower end to simultaneously drill on the bottom of the hole being drilled by the drilling bits and disposed to rotate in the same circular plane as the drilling bits.

24. A rotary well drilling tool comprisirg incomibnation a supporting head provid] with longitudinal slots communicating with respectively to the sides and base of said ead, reame'rs adaptedto have removable coo erative engagement with said head in said ongitudinal slots, each reamer having a relatively small portion rejecting beyond the side wall of said hea terminating in an elongated edge adapted to be resented to the formation being drilled, dri ing bits also adapted to have removable cooperative engagement with said head in said transverse slots, said drilling bits having cuttin edges projecting from the base of said ead, said cutting edges comprising knife-like ed 5 on the extreme lower edge of each drilling bit,rsaid knifehke edges functioning as'a horizontal cutting surface and being of considerable width,

said reamers being provided with cutting ed s on their lower end to simultaneously drfil on the bottom of the hole being drilled b the'drilling bits and disposed to rotate in t 0 same circular plane as the drilling bits. 5 In testimony whereof I aflix my signature.

CHARLES B. KENNEDYE.

said reamers being provided with cutting ed 8 on their lower end to simultaneously dn 1 on the bottom of the hole being drilled b the'drilling bits and disposed to rotate in t 0 same circular plane as the drilling bits.

In testimony whereof I afix my signature.

CHARLES B. KENNEDYE.

CERTIFICATE OF CORRECTION.

Patent No. 1,786,415. Granted December 23, 1930, to

CHARLES B. KENNEDYE.

It is hereby certified that error appears in the printed specification of the shove numbered'patent requiring correction as follows: Page 3, lines 74 to 76, claim 3, strike out the words "and extendingoutw'anily hcyontlthe side of the heat} to cut a hole of predetermined size" and insert the same to foflew after the word "slots" first occurrence, in line 78, of the same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 10th day of February, A. D. 1931.

M. J. Moore. (Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,786,415. Granted December 23, 1930, to

CHARLES B. KENNEDYE.

It is hereby certified that error appears in the printed specification of the above numbered'patent requiring correction as follows: Page 3, lines 74 to 76, claim 3, strike out the words "and extending outwardly beyondthe side of the head to cut a hole of predetermined size" and insert the same to foiiew after the word "slots" first occurrence, in line 78, of the same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Petent Office.

Signed and sealed this 10th day of February, A. D. 1931.

M. J. Moore. (Seal) Acting Cormieeieeer of Patent e. 

